NIST SRM 972a Vitamin D Metabolites in Human Serum from China
Certified reference material of human serum with accurately determined concentrations of 25-hydroxyvitamin D2 and D3 metabolites. Classified under HTS 3822.90.00.00 for its role in standardizing clinical assays for vitamin D deficiency testing. Certified values traceable to SI units for LC-MS/MS method validation.
Duty Rate — China → United States
12.5%
Rate breakdown
9903.05.3112.5%Except for products described in headings 9903.05.85–9903.05.92, articles the product of China, as provided for in U.S. note 52 to this subchapter
Import Tips
• Biohazard declaration and IATA shipping compliance for human serum matrix; include NIST CoA
• FDA biologics import permit may be required
• Maintain -80°C cold chain documentation